我有一个带有1个更新面板的asp页面,其中2个面板由2个按钮控制,如果单击第一个按钮,则第一个面板出现,第二个变为隐藏,如果单击第二个按钮,则第二个面板会发生相同的事情。它工作正常,没问题。
问题从第二个面板开始,我有另一个更新面板,负责打印错误消息。只检查输入长度的消息是否正常,但是那些涉及查询数据库以检查id有效性的消息没有打印出来。
我认为查询是问题,我已经在没有更新面板的单独页面中尝试过它们并且它们正常工作。问题出现在Update面板上。而我真的无法理解在哪里。如果你能帮助我,我将非常感激。
这是前端代码(我省略了一些无关紧要的细节):
<asp:Button ID="Button1" runat="server" Text="[Input your Id?]" />
<asp:Button ID="Button2" runat="server" Text="[Aditional info]" />
.....
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
< asp:Panel ID="Panel1" runat="server">
some code here
</asp:Panel>
<asp:Panel ID="Panel2" runat="server">
<b>*ID Number: </b>
<asp:TextBox ID="IdNo" runat="server" ></asp:TextBox><font size='2'>
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" class="errorMess" ErrorMessage="Letters are not Allowed!!" ControlToValidate="IdNumb" ValidationExpression="\d+"
runat="server" />
<asp:UpdatePanel ID="UpdatePanel3" runat="server">
<ContentTemplate>
<asp:Label ID="errorEm" class="errorMess" runat="server" Text="Please fill in the required fields"></asp:Label>
<asp:Label ID="errorLenght" class="errorMess" runat="server" Text="Id is too long!!!"></asp:Label>
<asp:Label ID="errorUser" class="errorMess" runat="server" Text="Id is not valid!!!"></asp:Label>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Button5" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
<asp:Button ID="Button5" runat="server" Text="Generate" /></td></tr>
</asp:Panel>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Button1" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
这是后端VB代码:
Protected Sub Button5_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button5.Click
If IdNo.Text = "" Then
Panel1.Visible = False
Panel2.Visible = True
errorEm.Visible = True
ElseIf IdNo.Text.Length > 9 Then
Panel1.Visible = False
Panel2.Visible = True
errorLenght.Visible = True
Else
Try 'everything that comes here does not work'
myconn.Open()
Dim stquery As String = "SELECT * from account WHERE user_id= @id"
Dim smd = New MySqlCommand(stquery, myconn)
smd.Parameters.AddWithValue("@id", Convert.ToInt32(IdNo.Text))
Dim myreader = smd.ExecuteReader()
If Not myreader.HasRows Then
Panel1.Visible = False
Panel2.Visible = True
errorUser.Visible = True
myconn.Close()
Return
Else
Panel1.Visible = False
Panel2.Visible = True
myreader.Read()
Dim ErrorMessage As String = "alert('User has been found');"
Page.ClientScript.RegisterStartupScript(Me.GetType(), "ErrorAlert", ErrorMessage, True)
myconn.Close()
End If
myconn.Close()
Catch ex As Exception
Dim ErrorMessage As String = "alert('" & ex.Message.ToString() & "');"
Page.ClientScript.RegisterStartupScript(Me.GetType(), "ErrorAlert", ErrorMessage, True)
myconn.Close()
End Try
End If
End Sub
答案 0 :(得分:0)
如果要从“更新”面板内部执行脚本 - 请勿使用
Page.ClientScript.RegisterStartupScript
使用
ClientScriptManager.RegisterStartupScript
代替。
参考:http://msdn.microsoft.com/en-us/library/system.web.ui.clientscriptmanager.registerstartupscript.aspx